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<li>创建 maven 工程</li>
<li>导入坐标</li>
<li>编写必要代码（实体类和持久层接口）</li>
<li>编写 SqlMapConfig.xml</li>
<li>编写映射配置文件</li>
<li>编写测试类  </li>
</ol>
<h2 id="用户映射文件配置"><a href="#用户映射文件配置" class="headerlink" title="用户映射文件配置"></a>用户映射文件配置</h2><blockquote>
<p>那些过于基础的…什么方法名要对应还是不浪费时间了…</p>
</blockquote>
<ul>
<li><p>resultType 属性：<br>用于指定结果集的类型</p>
</li>
<li><p>parameterType 属性:</p>
<p>用于指定传入参数的类型,传入的是一个类的对象 就写类的全名称。  </p>
</li>
<li><p>sql 语句中使用#{}字符：<br>它代表占位符， 相当于原来 jdbc 部分所学的?，都是用于执行语句时替换实际的数据。具体的数据是由#{}里面的内容决定的。</p>
</li>
<li><p>#{}中内容的写法：<br>如果数据类型是基本类型，所以此处可以随意写。一般还是使用方法接收的参数名</p>
<p>如果是一个 User 对象，此处要写 User 对象中的属性名称。<br>它用的是 ognl 表达式。  </p>
</li>
</ul>
<blockquote>
<p>ognl 表达式：<br>它是 apache 提供的一种表达式语言， 全称是：Object Graphic Navigation Language 对象图导航语言<br>它是按照一定的语法格式来获取数据的。语法格式就是使用 #{对象.对象}的方式</p>
<p>#{user.username}它会先去找 user 对象，然后在 user 对象中找到 username 属性，并调用<br>getUsername()方法把值取出来。但是我们在 parameterType 属性上指定了实体类名称，所以可以省略 user.<br>而直接写 username。  </p>
</blockquote>
<h2 id="测试类"><a href="#测试类" class="headerlink" title="测试类"></a>测试类</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MybastisCRUDTest</span> &#123;</span><br><span class="line">	<span class="keyword">private</span> InputStream in ;</span><br><span class="line">	<span class="keyword">private</span> SqlSessionFactory factory;</span><br><span class="line">	<span class="keyword">private</span> SqlSession session;</span><br><span class="line">	<span class="keyword">private</span> IUserDao userDao;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">	<span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">testFindOne</span><span class="params">()</span> &#123;</span><br><span class="line">	<span class="comment">//6.执行操作</span></span><br><span class="line">		<span class="type">User</span> <span class="variable">user</span> <span class="operator">=</span> userDao.findById(<span class="number">41</span>);</span><br><span class="line">		System.out.println(user);</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="meta">@Before</span><span class="comment">//在测试方法执行之前执行</span></span><br><span class="line">	<span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">init</span><span class="params">()</span><span class="keyword">throws</span> Exception &#123;</span><br><span class="line">		<span class="comment">//1.读取配置文件</span></span><br><span class="line">		in = Resources.getResourceAsStream(<span class="string">&quot;SqlMapConfig.xml&quot;</span>);</span><br><span class="line">		<span class="comment">//2.创建构建者对象</span></span><br><span class="line">		<span class="type">SqlSessionFactoryBuilder</span> <span class="variable">builder</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">SqlSessionFactoryBuilder</span>();</span><br><span class="line">		<span class="comment">//3.创建 SqlSession 工厂对象</span></span><br><span class="line">		factory = builder.build(in);</span><br><span class="line">		<span class="comment">//4.创建 SqlSession 对象</span></span><br><span class="line">		session = factory.openSession();</span><br><span class="line">		<span class="comment">//5.创建 Dao 的代理对象</span></span><br><span class="line">		userDao = session.getMapper(IUserDao.class);</span><br><span class="line">	&#125;</span><br><span class="line">    <span class="meta">@After</span><span class="comment">//在测试方法执行完成之后执行</span></span><br><span class="line">	<span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">destroy</span><span class="params">()</span> <span class="keyword">throws</span> Exception&#123;</span><br><span class="line">		session.commit();</span><br><span class="line">		<span class="comment">//7.释放资源</span></span><br><span class="line">		session.close();</span><br><span class="line">		in.close();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line">    </span><br></pre></td></tr></table></figure>

<h2 id="如果要获得新增用户id的返回值"><a href="#如果要获得新增用户id的返回值" class="headerlink" title="如果要获得新增用户id的返回值?"></a>如果要获得新增用户id的返回值?</h2><p>新增用户后， 同时还要返回当前新增用户的 id 值，因为 id 是由数据库的自动增长来实现的，所以就相当于我们要在新增后将自动增长 auto_increment 的值返回。  </p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">insert</span> <span class="attr">id</span>=<span class="string">&quot;saveUser&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;USER&quot;</span>&gt;</span></span><br><span class="line">	<span class="comment">&lt;!-- 配置保存时获取插入的 id --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">selectKey</span> <span class="attr">keyColumn</span>=<span class="string">&quot;id&quot;</span> <span class="attr">keyProperty</span>=<span class="string">&quot;id&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;int&quot;</span>&gt;</span></span><br><span class="line">		select last_insert_id();</span><br><span class="line">	<span class="tag">&lt;/<span class="name">selectKey</span>&gt;</span></span><br><span class="line">	insert into user(username,birthday,sex,address) values(#&#123;username&#125;,#&#123;birthday&#125;,#&#123;sex&#125;,#&#123;address&#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">insert</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>或者可以使用</p>
<blockquote>
<p>在自己的博客项目里使用的是下面这种</p>
</blockquote>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">insert</span> <span class="attr">id</span>=<span class="string">&quot;insert&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;me.xyt.entity.Article&quot;</span> <span class="attr">useGeneratedKeys</span>=<span class="string">&quot;true&quot;</span> <span class="attr">keyProperty</span>=<span class="string">&quot;articleId&quot;</span>&gt;</span></span><br><span class="line">       (sql语句)</span><br><span class="line"><span class="tag">&lt;/<span class="name">insert</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="模糊查询相关"><a href="#模糊查询相关" class="headerlink" title="模糊查询相关"></a>模糊查询相关</h2><ol>
<li><p>如果SQL语句 </p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">select * from user where username like #&#123;username&#125;</span><br></pre></td></tr></table></figure>

<p>则参数要 带上%</p>
</li>
<li><p>如果SQL语句 </p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">select * from user where username like &#x27;%$&#123;value&#125;%&#x27;</span><br></pre></td></tr></table></figure>

<p>在上面将原来的#{}占位符，改成了${value}。注意如果用模糊查询的这种写法，那么${value}的写法就是固定的，不能写成其它名字  </p>
</li>
</ol>
<h2 id="与-的区别"><a href="#与-的区别" class="headerlink" title="#{}与${}的区别"></a>#{}与${}的区别</h2><p><strong>#{}表示一个占位符号</strong>:<br>       通过#{}可以实现 preparedStatement 向占位符中设置值，自动进行 java 类型和 jdbc 类型转换，#{}可以有效防止 sql 注入。 #{}可以接收简单类型值或 pojo 属性值。 如果 parameterType 传输单个简单类型值， #{}括号中可以是 value 或其它名称。<br><strong>${}表示拼接 sql 串</strong>:<br>      通过 ${} 可以将 parameterType 传入的内容拼接在 sql 中且不进行 jdbc 类型转换， ${}可以接收简单类型值或 pojo 属性值，如果 parameterType 传输单个简单类型值， ${}括号中只能是 value。  </p>
<h2 id="MyBatis与JDBC编程的比较"><a href="#MyBatis与JDBC编程的比较" class="headerlink" title="MyBatis与JDBC编程的比较"></a>MyBatis与JDBC编程的比较</h2><ol>
<li><p>数据库链接创建、释放频繁造成系统资源浪费从而影响系统性能，如果使用数据库链接池可解决此问题。</p>
<p>解决：<br>在 SqlMapConfig.xml 中配置数据链接池，使用连接池管理数据库链接。</p>
</li>
<li><p>Sql 语句写在代码中造成代码不易维护，实际应用 sql 变化的可能较大， sql 变动需要改变 java 代码。</p>
<p>解决：<br>将 Sql 语句配置在 XXXXmapper.xml 文件中与 java 代码分离。</p>
</li>
<li><p>向 sql 语句传参数麻烦，因为 sql 语句的 where 条件不一定，可能多也可能少，占位符需要和参数对应。</p>
<p>解决：<br>Mybatis 自动将 java 对象映射至 sql 语句，通过 statement 中的parameterType 定义输入参数的<br>类型。</p>
</li>
<li><p>对结果集解析麻烦，sql 变化导致解析代码变化，且解析前需要遍历，如果能将数据库记录封装成 pojo 对象解析比较方便。</p>
<p>解决：<br>Mybatis 自动将 sql 执行结果映射至 java 对象，通过 statement 中的 resultType 定义输出结果的类型  </p>
</li>
</ol>
<h2 id="MyBatis输出结果封装——resultMap"><a href="#MyBatis输出结果封装——resultMap" class="headerlink" title="MyBatis输出结果封装——resultMap"></a>MyBatis输出结果封装——resultMap</h2><h3 id="resultMap"><a href="#resultMap" class="headerlink" title="resultMap"></a>resultMap</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">type</span>=<span class="string">&quot;com.itheima.domain.User&quot;</span> <span class="attr">id</span>=<span class="string">&quot;userMap&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">id</span> <span class="attr">column</span>=<span class="string">&quot;id&quot;</span> <span class="attr">property</span>=<span class="string">&quot;userId&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;username&quot;</span> <span class="attr">property</span>=<span class="string">&quot;userName&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;sex&quot;</span> <span class="attr">property</span>=<span class="string">&quot;userSex&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;address&quot;</span> <span class="attr">property</span>=<span class="string">&quot;userAddress&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;birthday&quot;</span> <span class="attr">property</span>=<span class="string">&quot;userBirthday&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>id 标签：用于指定主键字段<br>result 标签：用于指定非主键字段<br>column 属性：用于指定数据库列名<br>property 属性：用于指定实体类属性名称  </p>
<h3 id="映射配置"><a href="#映射配置" class="headerlink" title="映射配置"></a>映射配置</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;findAll&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;userMap&quot;</span>&gt;</span></span><br><span class="line">select * from user</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="SqlMapConfig-xml配置文件"><a href="#SqlMapConfig-xml配置文件" class="headerlink" title="SqlMapConfig.xml配置文件"></a>SqlMapConfig.xml配置文件</h2><h3 id="配置内容和顺序"><a href="#配置内容和顺序" class="headerlink" title="配置内容和顺序"></a>配置内容和顺序</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">-properties（属性）</span><br><span class="line">	--property</span><br><span class="line">-settings（全局配置参数）</span><br><span class="line">	--setting</span><br><span class="line">-typeAliases（类型别名）</span><br><span class="line">	--typeAliase</span><br><span class="line">	--package</span><br><span class="line">-typeHandlers（类型处理器）</span><br><span class="line">-objectFactory（对象工厂）</span><br><span class="line">-plugins（插件）</span><br><span class="line">-environments（环境集合属性对象）</span><br><span class="line">	--environment（环境子属性对象）</span><br><span class="line">		---transactionManager（事务管理）</span><br><span class="line">		---dataSource（数据源）</span><br><span class="line">-mappers（映射器）</span><br><span class="line">	--mapper</span><br><span class="line">	--package</span><br></pre></td></tr></table></figure>

<h4 id="properties可以使用配置文件配置"><a href="#properties可以使用配置文件配置" class="headerlink" title="properties可以使用配置文件配置"></a>properties可以使用配置文件配置</h4><p>定义db.properties</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">jdbc.driver=com.mysql.jdbc.Driver</span><br><span class="line">jdbc.url=jdbc:mysql://localhost:3306/eesy</span><br><span class="line">jdbc.username=root</span><br><span class="line">jdbc.password=1234</span><br></pre></td></tr></table></figure>

<h4 id="标签配置"><a href="#标签配置" class="headerlink" title="标签配置"></a>标签配置</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">properties</span> <span class="attr">url</span>=<span class="string">file:///D:/IdeaProjects/day02_eesy_01mybatisCRUD/src/main/resources/jdbcConfig.properties</span>&quot;&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">properties</span>&gt;</span></span><br></pre></td></tr></table></figure>



<ul>
<li><p>resource 属性：用于指定 properties 配置文件的位置，要求配置文件必须在类路径下<br>resource=”jdbcConfig.properties”</p>
</li>
<li><p>url 属性：<br>URL： Uniform Resource Locator 统一资源定位符<br><a target="_blank" rel="noopener" href="http://localhost:8080/mystroe/CategoryServlet">http://localhost:8080/mystroe/CategoryServlet</a> </p>
<p>URL 协议 主机 端口 URI</p>
</li>
<li><p>URI： Uniform Resource Identifier 统一资源标识符<br>/mystroe/CategoryServlet<br>它是可以在 web 应用中唯一定位一个资源的路径  </p>
</li>
</ul>
<h4 id="datasouece标签"><a href="#datasouece标签" class="headerlink" title="datasouece标签"></a>datasouece标签</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">&quot;POOLED&quot;</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;driver&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;jdbc.driver&#125;&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;url&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;jdbc.url&#125;&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;username&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;jdbc.username&#125;&quot;</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;password&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;jdbc.password&#125;&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dataSource</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="typeAliases（类型别名）"><a href="#typeAliases（类型别名）" class="headerlink" title="typeAliases（类型别名）"></a>typeAliases（类型别名）</h2><p>在 SqlMapConfig.xml 中配置：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">typeAliases</span>&gt;</span></span><br><span class="line"><span class="comment">&lt;!-- 单个别名定义 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">typeAlias</span> <span class="attr">alias</span>=<span class="string">&quot;user&quot;</span> <span class="attr">type</span>=<span class="string">&quot;com.itheima.domain.User&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!-- 批量别名定义，扫描整个包下的类，别名为类名（首字母大写或小写都可以） --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">&quot;com.itheima.domain&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">&quot;其它包&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">typeAliases</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="mappers-映射器"><a href="#mappers-映射器" class="headerlink" title="mappers(映射器)"></a>mappers(映射器)</h2><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--  使用相对于类路径的资源--&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">mapper</span> <span class="attr">resource</span>=<span class="string">&quot;com/itheima/dao/IUserDao.xml&quot;</span> /&gt;</span></span><br><span class="line"><span class="comment">&lt;!--  使用 mapper 接口类路径 --&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">mapper</span> <span class="attr">class</span>=<span class="string">&quot;com.itheima.dao.UserDao&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!-- 注意：此种方法要求 mapper 接口名称和 mapper 映射文件名称相同，且放在同一个目录中--&gt;</span></span><br><span class="line"><span class="comment">&lt;!--注册指定包下的所有 mapper 接口--&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">&quot;cn.itcast.mybatis.mapper&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!--注意：此种方法要求 mapper 接口名称和 mapper 映射文件名称相同，且放在同一个目录中。--&gt;</span></span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>资料参考: 黑马程序员</p>
</article><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/MyBatis/">MyBatis</a></div><div class="post_share"><div class="social-share" data-image="https://gitee.com/xyingtao/blogimage/raw/master/img/MyBatis.jpg" data-sites="wechat,weibo,qq"></div><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/butterfly-extsrc/sharejs/dist/css/share.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/butterfly-extsrc/sharejs/dist/js/social-share.min.js" defer></script></div></div><div class="post-reward"><div class="reward-button"><i class="fas fa-qrcode"></i> 打赏</div><div class="reward-main"><ul class="reward-all"><li class="reward-item"><a href="https://s2.loli.net/2022/08/21/Ay5sujrkH1nLTwW.jpg" target="_blank"><img class="post-qr-code-img" src= "" data-lazy-src="https://s2.loli.net/2022/08/21/Ay5sujrkH1nLTwW.jpg" alt="Wechat"/></a><div class="post-qr-code-desc">Wechat</div></li></ul></div></div><nav 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class="toc-text">MyBatis(二)-增删改查</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E7%8E%AF%E5%A2%83%E6%90%AD%E5%BB%BA"><span class="toc-number">1.1.</span> <span class="toc-text">环境搭建</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E7%94%A8%E6%88%B7%E6%98%A0%E5%B0%84%E6%96%87%E4%BB%B6%E9%85%8D%E7%BD%AE"><span class="toc-number">1.2.</span> <span class="toc-text">用户映射文件配置</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%B5%8B%E8%AF%95%E7%B1%BB"><span class="toc-number">1.3.</span> <span class="toc-text">测试类</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%A6%82%E6%9E%9C%E8%A6%81%E8%8E%B7%E5%BE%97%E6%96%B0%E5%A2%9E%E7%94%A8%E6%88%B7id%E7%9A%84%E8%BF%94%E5%9B%9E%E5%80%BC"><span class="toc-number">1.4.</span> <span class="toc-text">如果要获得新增用户id的返回值?</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%A8%A1%E7%B3%8A%E6%9F%A5%E8%AF%A2%E7%9B%B8%E5%85%B3"><span class="toc-number">1.5.</span> <span class="toc-text">模糊查询相关</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%8E-%E7%9A%84%E5%8C%BA%E5%88%AB"><span class="toc-number">1.6.</span> <span class="toc-text">#{}与${}的区别</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#MyBatis%E4%B8%8EJDBC%E7%BC%96%E7%A8%8B%E7%9A%84%E6%AF%94%E8%BE%83"><span class="toc-number">1.7.</span> <span class="toc-text">MyBatis与JDBC编程的比较</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#MyBatis%E8%BE%93%E5%87%BA%E7%BB%93%E6%9E%9C%E5%B0%81%E8%A3%85%E2%80%94%E2%80%94resultMap"><span class="toc-number">1.8.</span> <span class="toc-text">MyBatis输出结果封装——resultMap</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#resultMap"><span class="toc-number">1.8.1.</span> <span class="toc-text">resultMap</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%98%A0%E5%B0%84%E9%85%8D%E7%BD%AE"><span class="toc-number">1.8.2.</span> <span class="toc-text">映射配置</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#SqlMapConfig-xml%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6"><span class="toc-number">1.9.</span> <span class="toc-text">SqlMapConfig.xml配置文件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%85%8D%E7%BD%AE%E5%86%85%E5%AE%B9%E5%92%8C%E9%A1%BA%E5%BA%8F"><span class="toc-number">1.9.1.</span> <span class="toc-text">配置内容和顺序</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#properties%E5%8F%AF%E4%BB%A5%E4%BD%BF%E7%94%A8%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6%E9%85%8D%E7%BD%AE"><span class="toc-number">1.9.1.1.</span> <span class="toc-text">properties可以使用配置文件配置</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%A0%87%E7%AD%BE%E9%85%8D%E7%BD%AE"><span class="toc-number">1.9.1.2.</span> <span class="toc-text">标签配置</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#datasouece%E6%A0%87%E7%AD%BE"><span class="toc-number">1.9.1.3.</span> <span class="toc-text">datasouece标签</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#typeAliases%EF%BC%88%E7%B1%BB%E5%9E%8B%E5%88%AB%E5%90%8D%EF%BC%89"><span class="toc-number">1.10.</span> <span class="toc-text">typeAliases（类型别名）</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#mappers-%E6%98%A0%E5%B0%84%E5%99%A8"><span class="toc-number">1.11.</span> <span class="toc-text">mappers(映射器)</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/posts/4995/" title="顺德好友小聚"><img src= "" 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